Can you explain plz help

HELP ME WILL MARK Brainly

Viktor [21]

Answer:

mean (average) is 17.6

mean absolute deviation is 15.2

<em>Step-by-step explanation:</em>

to find <em>mean</em>, u add up all your numbers and divide by how many there are...

to find <em>mean absolute deviation</em> you find the mean of the data and subtract that amount to each of your data pieces...

then u find absolute value of each of them (to make them all positive)

then u add all of those numbers up and divide by how many there are, and that is your answer!!

<em>Hope this helps u in the future!!</em>

6 0

4 years ago

If a boy 5 feet tall casts a shadow 14 feet long, what will be the length of the shadow of a tree that is 25 feet high?

klemol [59]

Answer:

70 feet

Step-by-step explanation:

This problem can be answered by using proportions based on similar triangles.

Notice that a person and its shadow on the ground form a right angle (therefore they can be considered the two "legs" of a right angle triangle)

The same runs for the tree and its shadow.

Since the inclination of the rays of the sun are the same at the same time for both objects (the boy and the tree), their hypothenuses form the same angles with the ground and therefore belong to similar triangles.

We can create the following proportion to solve for the shadow of the tree (ST) using the information provided: the height of the boy (HB), the shadow of the boy (SB), and the height of the tree (HT)

$\frac{SB}{HB} =\frac{ST}{HT}\\\frac{14}{5} =\frac{ST}{25}\\\frac{ST}{25}=\frac{14}{5} \\ST=\frac{14*25}{5}\\ST=70\,\,ft$

6 0

4 years ago

Helena wants to paint a box in the shape of a cube with sides that are 18 inches long. what is the surface area that Helena will

yan [13]

Answer:

1944 Inches Squared

Step-by-step explanation:

Surface area Formula for a Cube:

$A = 6a^2$

The "edge", which is also the side, is 18 inches.

$a = 18$

Solve the formula.

$A= 6a^2 = 6(18)^2 = 6 * 18^2\\18^2 = 324\\324 * 6 = 1944\\A=1944$

The cube's surface area should be 1944 square inches.

5 0

3 years ago

I NEED IMMEDIATE HELP!!!!

DerKrebs [107]

<h2>Hello!</h2>

The answers are:

C) $(3+xz)(-3+xz)$

D) $(y^2-xy)(y^2+xy)$

F) $(64y^2+x^2)(-x^2+64y^2)$

To know which of the products results in a difference of square, we need to remember the difference of squares from:

The difference of squares form is:

$(a+b)(a-b)=a^{2}-b^{2}$

So, discarding each of the given options in order to find which products result in a difference of squares, we have:

$(x-y)(y-x)=xy-x^{2}-y^{2} +yx=-x^{2} -y^{2}$

So, the obtained expression is not a difference of squares.

$(6-y)(6-y)=36-6y-6y+y^{2}=y^{2}-12y+36$

So, the obtained expression is not a difference of squares.

$(3+xz)(-3+xz) =(xz+3)(xz-3)=(xz)^{2}-3xz+3xz-(3)^{2}\\\\(xz)^{2}-3xz+3xz-(3)^{2}=(xz)^{2}-(3)^{2}$

So, the obtained expression is a difference of squares since it matches with the form of the difference of squares.

$(y^2-xy)(y^2+xy)=(y^{2})^{2}+y^{2}*xy-y^{2}*xy-(xy)^{2} \\\\(y^{2})^{2}+y^{2}*xy-y^{2}*xy-(xy)^{2}=(y^{2})^{2}-(xy)^{2}$

So, the obtained expression is a difference of squares since it matches with the form of the difference of squares.

$(25x-7y)(-7y+25x)=-175xy+(25x)^{2}+49y^{2}-175xy\\\\-175xy+(25x)^{2}+49y^{2}-175xy=(25x)^{2}+49y^{2}-350xy$

So, the obtained expression is not a difference of squares

$(64y^2+x^2)(-x^2+64y^2)=(64y^2+x^2)(64y^2-x^2)\\\\(64y^2+x^2)(64y^2-x^2)=(64y^{2})^{2} -(x^{2}*64y^{2})+(x^{2}*64y^{2})-(x^{2})^{2}\\ \\(64y^{2})^{2} -(x^{2}*64y^{2})+(x^{2}*64y^{2})-(x^{2})^{2}=(64y^{2})^{2}-(x^{2})^{2}$

So, the obtained expression is a difference of squares since it matches with the form of the difference of squares.

Hence, the products that result in a difference of squares are:

C) $(3+xz)(-3+xz)$

D) $(y^2-xy)(y^2+xy)$

F) $(64y^2+x^2)(-x^2+64y^2)$

Have a nice day!

5 0

4 years ago

Find the length of the hypotenuse in the following figure,

notka56 [123]

Use Pythagorean theorem to help solve this problem.

a = 16

b = 12

c = hypotenuse

a^2 + b^2 = c^2. Plug in your numbers.

(16)^2 + (12)^2 = c^2. Square both 12 and 16

256 + 144 = c^2. Add together a and b

400 = c^2. Take the square root of both sides.

20 = c.

8 0

3 years ago